Demi Lovato Unveils New Song "Heart Attack"—Listen Now!

Sunday night, the X Factor judge premiered her new single, "Heart Attack," on Ryan Seacrest's KIIS FM radio show's site. The single was supposed to premiere March 4 on the show, but she surprised her fans with an early release.

In the catchy, upbeat tune, the 20-year-old star sings (with a little help from Auto-Tune), "Puttin' my defenses up 'cause I don't wanna fall in love / If I ever did that, I think I'd have a heart attack."